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with one eye closed from the side AC of the prism. Fix another two pins R and S on the<br />
paper such that the tips of these pins and images of the incident ray pins (P and Q) all lie<br />
in the same straight line.<br />
7. Remove the pins and prism. Encircle the pin pricks with a sharp pencil.<br />
8. Join R and S and extend it backward to point Y on AC. Draw a normal N as shown in the<br />
2<br />
diagram.<br />
9. Join XY, which shows the path of light ray inside the prism.<br />
10. Now PQXYRS shows the path of the rays of light passing through the prism.<br />
11. Repeat steps 2 to 10 for other angles of the incidence.<br />
OBSERVATIONS:<br />
From the diagram it is clear that as the ray moves from air ( optically rarer medium ) to glass<br />
(optically denser medium ) it bend towards the normal. And when it moves from glass( optically<br />
denser medium ) to air( optically rarer medium ) it bends away from the normal.<br />
RESULT :<br />
PQXYRS represents the path of light ray through the prism as shown in the diagram.<br />
PRECAUTIONS :<br />
1. The same prism should be used for all observations.<br />
2. Prism should be placed properly inside the drawn marking.<br />
3. The angle of incidence should be taken between 30 degrees to 60 degrees.<br />
4. The separation between the pins should not be less than 6 cm.<br />
5. The pins should be fixed vertically and firmly.<br />
6. The points of incidence should be taken approximately in the middle portion of the<br />
prism.<br />
101
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